Bowel preparation protocol for hospitalized patients ages 50 years or older: A randomized controlled trial

Table 1 Demographics of the study patients, n (%)

Characteristics	Group 11, n = 148	Group 22, n = 156	P value
Age in yr	65.76 ± 7.843	66.99 ± 9.337	0.377
Male sex	100 (67.6)	105 (67.3)	0.961
Lifestyle habits
Current smoking	30 (20.3)	33 (21.2)	0.849
Smoking history	63 (42.6)	66 (42.3)	0.963
Current drinking	34 (23.0)	35 (22.4)	0.911
Drinking history	40 (27.0)	41 (26.3)	0.883
History of abdominopelvic surgery	41 (27.9)	56 (36.1)	0.125
Comorbidity
Constipation	19 (12.8)	25 (16.0)	0.430
Drugs for constipation	7 (4.7)	10 (6.4)	0.524
Diabetes	64 (43.2)	74 (47.4)	0.463
Hypertension	86 (58.1)	89 (57.4)	0.903
Chronic heart failure	2 (1.4)	4 (2.6)	0.728
Coronary heart disease	19 (12.8)	34 (21.8)	0.040
Chronic kidney disease (≥ stage 2)	99 (66.8)	89 (57.0)	0.280
Chronic obstructive pulmonary disease	6 (4.1)	8 (5.1)	0.655
Nutritional status
BMI in kg/m2	24.325 ± 3.049	24.569 ± 2.936	0.718
Hemoglobin in g/L	135.91 ± 15.903	135.30 ± 15.906	0.675
Albumin in g/L	39.542 ± 3.0895	39.469 ± 3.7827	0.710
Interval between last dose of laxatives and colonoscopy in h	4.71 ± 1.248	4.26 ± 1.315	0.003

¹Group 1: 30 mL of lactulose on the day before the colonoscopy, three meals with a low-residue liquid diet, and 2 L of water mixed with polyethylene glycol on the colonoscopy day.

²Group 2: Regular diet for breakfast and lunch, fasting or a low-residue liquid diet for dinner, and 2 L of water mixed with polyethylene glycol (PEG) on the day before the colonoscopy; 2 L of water mixed with PEG on the colonoscopy day.

Data are mean ± SD or n (%). BMI: Body mass index.